I believe today, we are in a time of faith and hope. This is the means we are to please God. Without faith, it is impossible to please Him. So, things such as sickness may be present to test that faith. We need to hold fast to the truth and confession even in the face of outward, contradictory evidence. But that test is between the individual and God. Our faith stance should be that He has healed us. At the end of the "faith chapter" in Heb 11, we see OT believers who believed even tho they never received, even to their deaths. They believed, which in their case was the only evidence of the unseen thing. Faith was the only substance of the thing they hoped for. And despite never having received in the days of their lives, they pleased God. I believe this should be our faith stance regarding healing and, in many cases, prayer. We are to believe that we have received when we pray.
You are correct that in heaven, we will have perfected bodies that have no need of healing. As for today, we are to pray His will be done on earth as it is in heaven. We are to pray for bodies that are healthy and have no need of healing.
Peace.